<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>消除默认样式</title>
    <!-- 最主要的是看，用浏览器端的元素检测去看盒子模型有没有margin和padding -->
    <!-- 通过元素检查，发现h3标签的盒子模型默认也有margin -->
     <style>
        body,
        h3,
        ul,
        p {
            margin: 0;
            padding: 0;
        }
        ul li {
            list-style: none;
        }
        a {
            color: #000;
            text-decoration: none;
        }

     </style>
</head>
<body>
    
</body>
</html>